Honestly, you will never be able to say *always* b/c every kid is an individual. I also think ADHD is probably like cancer...there are several causes. I read that for some kids, they outgrow the ADHD and others do not. I also saw a reference to some research that indicates drugs inhibit those that would outgrow it, from outgrowing it but it was only blurb, I didn't see an original reference for that statement. All that to say, I think different ADHD kids will present differently. Some might have lower coding scores and others might not.
